Thx. I should probably qualify my "all the index files" by adding the word recommended to it in that I just selected the recommended ones for the FOV I've set (basically covering from 1000' to 240').

The relatively unknown part is that iOptron list the FOV as approx 13 degrees (so 780') which is what I have it set to currently, that's not necessarily what the FOV actually is tho as it's not exactly well documented. However the image I solved online came back with a radius of 6.858 degrees in the calibration info which would track with approx 13 degrees I guess.

Anyway, I think the iPolar works with the v4l driver for the purpose of capturing so the rest is probably just down to tweaking and/or vagaries of my setup.

Jacqui

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